New Prius Battery Kit (GEN2, 2004-2009)

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New Prius Battery Kit (GEN2, 2004-2009)

The next shipment is expected around Nov 10th 2020


What is this?

This is a DIY kit to completely and fully replace your aging or dead Toyota Prius Hybrid Battery (a.k.a. Traction Battery) with brand new battery modules, bus-bars, battery wiring harness, and interconnects. You retain your original metal enclosure and hybrid ECU.

Will this work with my Vehicle?

This is meant for Generation-2 Toyota Prius vehicles, model years 2004 through 2009. We also have kits available for Generation-1 (2001-2003) and Generation-3 (2010-2015) available with request. These modules will work in any number of Toyota and other makes that use the same Panasonic battery design, but the wiring kit is specific to the Prius. With extra (and non-supported) DIY, you could potentially make it work with many more vehicles.
Brand New Batteries: Not a refurb or rebuild. These are brand new modules fresh out of the factory and have never been in a vehicle. ZERO miles driven.
Superior Design: Cylindrical cells, half the battery modules, and all the same functionality. Upgrade your Hybrid Pack today!
Factory Warranty: A 2 year or 25,000 mile warranty on the modules. Fleet vehicles included.

How Much?

For $1600 and 4 hours of installation time, you will get a brand new hybrid battery backed by a 2-year or 25,000 mile warranty including fleet vehicles. There is nothing comparable out there. All other options that are not original Toyota Hybrid packs, are used modules. Some are refurbished and/or balanced to be better matched with one another, but they are still all used batteries from wrecked, salvaged, totalled, or other failed Prius vehicles. In contrast these batteries from are brand new and never used. When you start driving on your new pack, it starts with zero miles on it, just like a brand new Prius from the factory.

The Smarter Financial Investment

Don't waste your money on refurbished or remanufactured batteries. The only real solution to repair your Toyota Prius Hybrid Battery is to replace the entire pack. Anything else is a temporary band-aid, akin to playing the game whack-a-mole. Why spend the same money to put in used modules inside a refurbished pack instead of buying new modules from us? Our batteries at are the smartest choice for any Toyota Prius needing a Hybrid Battery pack replacement.


The Hybrid Battery is different than an original Toyota Hybrid Battery, but it is made to be interchangeable. The largest differences and features are highlighted below
Half the Modules: An original Toyota pack uses 28 modules paired into 14 blocks. We've simplified the design and now you just need 14 larger modules making the same 14 blocks
Fully Compatible: Designed to be 100% backwards compatible with the original modules. Uses the same wire connectors, same mounting, same temperature sensors, same enclosure.
Factory Warranty: A 2 year or 25,000 mile warranty on the modules
Cylindrical Cells: These cells are shaped like a series of large D-Cell batteries instead of the rectangular bricks of the original.
New Bus Bars: The kit comes complete with new solid metal bus-bars to connect adjacent modules together, new nuts, and new wiring.
No Core Charge: When you order, you get your battery pack kit. There is no extra charge for a core, and no deposit required. Your old parts can be saved or sold to offset the cost.
Standard Installation Flow

These kits are no more difficult to install than a standard battery swap. In fact, it is recommended to follow one of the many YouTube videos of how to disassemble your 2004-2009 Toyota Prius [Contact Us for Gen1 (2001-2003) and Gen3 kits (2010-2015)] to access the Hybrid Battery and to put it back together.

Disassemble Prius to Access Hybrid Battery
This involves removing the false floor, some interior plastic panels, and disconnecting the rear seats. All can be done with a socket wrench and a screw-driver. A power-drill is recommended with a socket attachment to make life easier. Average time for a first-time disassemble is roughly 1 hour. An experienced rebuilder can usually do this within 5-10 minutes.
Remove Hybrid Battery from Vehicle
This is a heavy part, it is best to have help. You will need to access the bottom of the pack, so it does need to be fully removed. It cannot be worked on in the car.
Disassemble Original Hybrid Battery
Remove the cover, remove the battery nuts, remove the bus bars, disconnect the venting, disconnect the temperature sensors, remove the tension bar, and end up with the shell of a battery. Since there is no core charge, you are welcome to keep your old modules or to sell them on eBay for others venturing to make refurbished used packs to help offset the cost of your brand new pack! Remember if you ever intend to extract a core exchange fee, you will need your original modules at this time.
Assemble Brand New Hybrid Traction Pack
Line up your modules in serial order. Each of the 14 modules is marked from #1 through #14, and put them in order. Attach the bus-bars, battery nuts, and new wiring harness. Move battery to original enclosure. Attach temperature sensors via included clips. Attach modules from the bottom to the original battery enclosure. Complete the wiring, and put the cover back on the battery. That's it! Average time for a first install is about 1 hour if you are taking your time.
Re-Install Hybrid Battery in Vehicle
Again, this is a heavy part and it is best to have help. Carefully place the newly assembled battery back into the Prius.
Reassemble the Prius
Now it is time to put all the bolts, screws, and plastic panels that make up the rear of Prius back together. This may take an hour for a first time builder, again 5-10 minutes for an experienced installer.
Complete Install
Make sure to latch the orange safety interconnect back in-place (it can be tricky!) and READY the vehicle. If you have codes, it is best to clear them before driving. Your brand new battery is now installed and should be trouble free and worry free for a very long time. You also have the peace of mind that your brand new battery from is fully warranted for 2 years or 25,000 miles, whichever comes first. In the unlikely event of a warranty replacement, we will send you a new battery module for you to install.
Included in the Kit

The Prius Battery Kit requires some installation. If you are not comfortable working with high voltage DC, any hybrid battery installer local to your area should be able to provide the service for you, and the installer may contact us with any questions.
14 Cylindrical Battery Modules: The life-blood of your Hybrid Battery Pack.
Bus-Bars and Nuts: Solid metal bus-bars and nuts to connect the battery modules together and to the enclosure.
Wiring Harness: A new wiring harness to connect to each of the 14 modules, the safety interconnect, and the HV ECU.
Mounting Screws: To secure the battery modules to the original Toyota metal enclosure.
Battery Module Spacers: Orange High Voltage plastic spacers to secure the battery modules.
Battery Module Covers: Orange High Voltage plastic covers to limit exposed high voltage connections.
Temperature Sensor Mounts: Three plastic clips that secure the original temperature sensors to the new battery modules
Customer Support Email: If you have questions before, during, or after your installation feel free to contact us.

2 year or 40,000km/25,000mi warranty. Modules are warranted for block voltage error codes. Installation, labour, and shipping are not included in the warranty. Warranty is serviced by battery factory with as the intermediary.

37 Reviews Hide Reviews Show Reviews

  • 5
    New Prius Battery Kit

    Posted by Jack Lockard on Sep 11th 2019

    My 2005 Prius died. Not sure what to do on battery replacement..... The dealer & auto parts stores only sold refurbished battery's. I thought on the life expectancy of doing that. (used battery's) Since the drive battery is the "Heart beat" of the Prius. After extensive research I found New Prius Battery website. After corresponding with them it was a better deal in more ways then one. I installed the battery pack. Very easy installation. The car started right up, fuel economy much improved !! Over six thousand miles now on long trips and no issues. Its like when I bought it new. Save time and money ,,,,,do the job right...

  • 5
    05 Prius Battery Kit - California

    Posted by Nobu-nontoko on Sep 1st 2019

    Ordered the kit for my 05 Prius with 250000 miles and received it less than a week period. Good email communication from the seller with attached installation manual. The Packaging was well made so no damage to the kit. Only thing missing were mounting screws to the metal casting but ended up using my old ones so not really was an issue. The installation was straight forward but may be little confusing if you are not familiar with these system. All and all everything worked as it should but a little tweak was needed to attach the orange safety disconnect cables.
    Now the car is running really smooth. Hopefully it will last me at least another 5 years....only the time will tell.

  • 5
    New Prius Battery Kit (GEN2, 2004-2009)

    Posted by Terri Bowen on Aug 24th 2019

    easy to install, fast turn around... would recommend to anyone! installed in 2005 Prius (which I bought new), from day one my average mileage was 46-47mpg, since replacing with this new kit, i have been getting 53-54mpg!!! Customer service is also great, had a question and they responded right away! THANKS!!!

  • 4
    Whats needed

    Posted by David Gwerder on Aug 23rd 2019

    Documentation is in disarray, I do not see how an novice cold possibly build this without help. No instructions for harness or how/where the plastic covers go. No way these covers will work in the area of the large power wires without more information.

  • 5
    New Prius Battery gen2 2006

    Posted by Thomas Walsh on Aug 20th 2019

    Went together with no problems at all. Highly recommend to keep car on the road. Comparable SOC levels and MPG. Nick was right there with suggestions along the way. A+++

  • 4
    Duke Rhoades

    Posted by Duke Rhoades on Aug 13th 2019

    Duke Rhoades Everything is fine, except that we have seen no warranty details and no way to contact the factory in Oregon. That information would be greatly appreciated. Duke & Lisa

  • 4
    NPB Kit Gen2, -04-09

    Posted by David Young on Aug 5th 2019

    Ordered the pack a few weeks ago. Shipped that Friday, arrived following Wednesday; on time and as expected.

    Everything was nicely packaged, instructions are clear, and the installation looks professional.

    Only one issue, the cables for the safety disconnect are actually a bit long after the swap. So it too some strong hands (not mine) to actually get them routed. We added some tubing to cover the sharp edge on the cover, after deburring first.

    Battery condition is dramatically more stable. No chance lately to get the batteries fully charged or to even get 30mph. Just a few 1 and 2mile trips. MPG is inching up, but it needs a longer drive, with a down hill section.

  • 5
    HIghly recommended

    Posted by William Shipley on Aug 2nd 2019

    These batteries fit into the battery frame better than the originals did. They have better mounting, better cable management, and they're simpler to install. If you're debating about swapping out 4-5 cells or getting new ones, replacing all of them via this route is actually a lot easier than doing it piecemeal, and the result is better.

  • 5
    Tony Briseno

    Posted by Tony Briseno on Jul 31st 2019

    Battery system working well. I would recommend some additions to the instructional manual. Add arrows to #7 wire attachments as was done for #8 and consider another arrangement for extra length of disconnect cables.